President Donald Trump said on Tuesday he was nominating Jared Isaacman, the private astronaut and ally of billionaire Elon Musk, for the office of administrator of NASA.

Isaacman was removed from consideration to lead NASA earlier this year amid a high-profile falling out that Trump had with Musk. Sean Duffy, the head of the U.S. Department of Transportation, was named acting NASA chief.

“This evening, I am pleased to nominate Jared Isaacman, an accomplished business leader, philanthropist, pilot, and astronaut, as Administrator of NASA,” Trump said on social media. The role requires a Senate confirmation.

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(Reporting by Kanishka Singh in Washington; Editing by Chris Reese)